Montreal Dental Imaging, the premier dental radiology service in the greater Montreal, is dedicated to offering you reliable, rapid services to help you integrate 3D imaging into your daily practice.
Montreal Dental Imaging - cutting edge imaging centers for you and your patients
At Montreal Dental Imaging, we guaranty professional and reliable services. Reports are provided to you by board-certified oral & maxillofacial radiologists with a short turn-around time with all the necessary imaging files to help you treat your patients according to the highest standards. We can also convert DICOM files to STL format for use with proprietary treatment planning softwares.
These are some of the services we offer :
- Pre-surgical implant planning evaluation
- Evaluation of impacted teeth such as third molars, canines and mesiodens
- Evaluation of bony maxillofacial pathology such as cysts and tumours
- Use of i-CAT low dose radiation protocols
- Advanced reformatted images for better diagnosis
What is cone beam CT?
In CBCT, imaging is accomplished by a rotating gantry to which an x-ray source and detector are attached. A cone-shaped source of ionizing radiation is directed though the area to be examined onto an x-ray detector on the opposite side. A rotation fulcrum is fixed within the center of the object of interest and the x-ray source and detector rotate around it. During this rotation between 150 and 600 planar projection images of the field of view (FOV) are acquired. It differs for the traditional CT, which uses a fan-shaped x-ray beam in helical progression to obtain individual image slices of the FOV, which are subsequently stacked to create a 3-dimensional image. In CBCT, since the entire FOV is encompassed, a single rotation is sufficient to acquire enough information to reconstruct the image appropriately.
Patient positioning in CBCT - Practical considerations
Cone beam machines can scan patients in 3 possible positions: sitting, standing or supine. Supine units take up a greater amount of space and may be inaccessible to patients with physical disabilities. The standing unit may not be able to accommodate height to allow for wheel-chair patients. The seated unit offers the greatest comfort to the patient, but fixed seats may also pose a challenge to disabled or wheel-chair-bound patients.
Advantages of the CBCT:
- The cone beam geometry was developed to allow for a more rapid acquisition of images, using a less costly detector. As a result, professionals and their patients can benefit from shorter examination times and a more cost-effective procedure.
- An additional advantage of CBCT technology is the reduction of image distortion. This is due to the brief acquisition time with limited patient movement and the improved efficiency of the x-ray tube.
- The primary beam of the CBCT is collimated, which limits the amount of radiation to the area of interest.
- The images produced by CBCT have a resolution ranging from 0.4 mm to as low as 0.076 mm. As a result, subsequent secondary (axial, coronal and sagittal) and multiplanar reformation images can yield sufficiently accurate spatial resolution for the measurements required in such maxillofacial procedures, in particular for implant placement planning and orthodontic analysis, which require precision in all dimensions.
- Reduction in patient radiation dose. CBCT technology provides a very significant dose reduction – in the range of up to 98.5%, as compared to the conventional CT used for maxillofacial imaging, which exposes the patient to a dose of approximately 2000 µSv.
- Availability of interactive display modes. CBCT provides a unique capability not afforded by intraoral, panoramic or cephalometric imaging, to view images in 3-D. Projection data is reconstructed to provide inter-relational images in axial, sagittal and coronal planes. Because this is done on a personal computer, the data can be oriented so the patient’s features are realigned.
How can CBCT be applied to daily practice?
- Assessment of bony and dental pathologies
- Structural maxillofacial deformity and fracture recognition
- Preoperative assessment of impacted teeth
- TMJ imaging
- Assessment of adequacy of bone availability for implant placement
Because CBCT can be converted to an STL format it as popularized the use of several third party softwares designed to for 3D visualization and planning.
Several software are available for :
- Orthodontics for diagnosis and assessment
- Implant planning for the preparation of surgical models
- Virtual implant placement and fabrication of surgical guides
- Assisting computer-aided design and manufacture of implant prosthetics
How will I obtain the report and have access to my patient's study?
You will receive, based on your choice, the radiology report and images on CD or on printed paper. Please refer to our prescription form for details.
To learn more about i-CAT technology and its clinical indications,